8x+4x-84=105-9x

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Solution for 8x+4x-84=105-9x equation: 



8x+4x-84=105-9x

We move all terms to the left:

8x+4x-84-(105-9x)=0

We add all the numbers together, and all the variables

8x+4x-(-9x+105)-84=0

We add all the numbers together, and all the variables

12x-(-9x+105)-84=0

We get rid of parentheses

12x+9x-105-84=0

We add all the numbers together, and all the variables

21x-189=0

We move all terms containing x to the left, all other terms to the right

21x=189

x=189/21

x=9

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